2 * Copyright (C) 1995 Linus Torvalds
6 * This file handles the architecture-dependent parts of initialization
9 #include <linux/errno.h>
10 #include <linux/sched.h>
11 #include <linux/kernel.h>
13 #include <linux/stddef.h>
14 #include <linux/unistd.h>
15 #include <linux/ptrace.h>
16 #include <linux/slab.h>
17 #include <linux/user.h>
18 #include <linux/a.out.h>
19 #include <linux/screen_info.h>
20 #include <linux/ioport.h>
21 #include <linux/delay.h>
22 #include <linux/init.h>
23 #include <linux/initrd.h>
24 #include <linux/highmem.h>
25 #include <linux/bootmem.h>
26 #include <linux/module.h>
27 #include <asm/processor.h>
28 #include <linux/console.h>
29 #include <linux/seq_file.h>
30 #include <linux/crash_dump.h>
31 #include <linux/root_dev.h>
32 #include <linux/pci.h>
33 #include <linux/acpi.h>
34 #include <linux/kallsyms.h>
35 #include <linux/edd.h>
36 #include <linux/mmzone.h>
37 #include <linux/kexec.h>
38 #include <linux/cpufreq.h>
39 #include <linux/dmi.h>
40 #include <linux/dma-mapping.h>
41 #include <linux/ctype.h>
44 #include <asm/uaccess.h>
45 #include <asm/system.h>
50 #include <video/edid.h>
53 #include <asm/mpspec.h>
54 #include <asm/mmu_context.h>
55 #include <asm/proto.h>
56 #include <asm/setup.h>
57 #include <asm/mach_apic.h>
59 #include <asm/sections.h>
61 #include <asm/cacheflush.h>
67 struct cpuinfo_x86 boot_cpu_data __read_mostly;
68 EXPORT_SYMBOL(boot_cpu_data);
70 unsigned long mmu_cr4_features;
72 /* Boot loader ID as an integer, for the benefit of proc_dointvec */
75 unsigned long saved_video_mode;
77 int force_mwait __cpuinitdata;
83 char dmi_alloc_data[DMI_MAX_DATA];
88 struct screen_info screen_info;
89 EXPORT_SYMBOL(screen_info);
90 struct sys_desc_table_struct {
91 unsigned short length;
92 unsigned char table[0];
95 struct edid_info edid_info;
96 EXPORT_SYMBOL_GPL(edid_info);
98 extern int root_mountflags;
100 char __initdata command_line[COMMAND_LINE_SIZE];
102 struct resource standard_io_resources[] = {
103 { .name = "dma1", .start = 0x00, .end = 0x1f,
104 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
105 { .name = "pic1", .start = 0x20, .end = 0x21,
106 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
107 { .name = "timer0", .start = 0x40, .end = 0x43,
108 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
109 { .name = "timer1", .start = 0x50, .end = 0x53,
110 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
111 { .name = "keyboard", .start = 0x60, .end = 0x6f,
112 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
113 { .name = "dma page reg", .start = 0x80, .end = 0x8f,
114 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
115 { .name = "pic2", .start = 0xa0, .end = 0xa1,
116 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
117 { .name = "dma2", .start = 0xc0, .end = 0xdf,
118 .flags = IORESOURCE_BUSY | IORESOURCE_IO },
119 { .name = "fpu", .start = 0xf0, .end = 0xff,
120 .flags = IORESOURCE_BUSY | IORESOURCE_IO }
123 #define IORESOURCE_RAM (IORESOURCE_BUSY | IORESOURCE_MEM)
125 struct resource data_resource = {
126 .name = "Kernel data",
129 .flags = IORESOURCE_RAM,
131 struct resource code_resource = {
132 .name = "Kernel code",
135 .flags = IORESOURCE_RAM,
137 struct resource bss_resource = {
138 .name = "Kernel bss",
141 .flags = IORESOURCE_RAM,
144 #ifdef CONFIG_PROC_VMCORE
145 /* elfcorehdr= specifies the location of elf core header
146 * stored by the crashed kernel. This option will be passed
147 * by kexec loader to the capture kernel.
149 static int __init setup_elfcorehdr(char *arg)
154 elfcorehdr_addr = memparse(arg, &end);
155 return end > arg ? 0 : -EINVAL;
157 early_param("elfcorehdr", setup_elfcorehdr);
162 contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
164 unsigned long bootmap_size, bootmap;
166 bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;
167 bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);
169 panic("Cannot find bootmem map of size %ld\n",bootmap_size);
170 bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, end_pfn);
171 e820_register_active_regions(0, start_pfn, end_pfn);
172 free_bootmem_with_active_regions(0, end_pfn);
173 reserve_bootmem(bootmap, bootmap_size);
177 #if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
179 #ifdef CONFIG_EDD_MODULE
183 * copy_edd() - Copy the BIOS EDD information
184 * from boot_params into a safe place.
187 static inline void copy_edd(void)
189 memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
190 sizeof(edd.mbr_signature));
191 memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
192 edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
193 edd.edd_info_nr = boot_params.eddbuf_entries;
196 static inline void copy_edd(void)
202 static void __init reserve_crashkernel(void)
204 unsigned long long free_mem;
205 unsigned long long crash_size, crash_base;
208 free_mem = ((unsigned long long)max_low_pfn - min_low_pfn) << PAGE_SHIFT;
210 ret = parse_crashkernel(boot_command_line, free_mem,
211 &crash_size, &crash_base);
212 if (ret == 0 && crash_size) {
213 if (crash_base > 0) {
214 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
215 "for crashkernel (System RAM: %ldMB)\n",
216 (unsigned long)(crash_size >> 20),
217 (unsigned long)(crash_base >> 20),
218 (unsigned long)(free_mem >> 20));
219 crashk_res.start = crash_base;
220 crashk_res.end = crash_base + crash_size - 1;
221 reserve_bootmem(crash_base, crash_size);
223 printk(KERN_INFO "crashkernel reservation failed - "
224 "you have to specify a base address\n");
228 static inline void __init reserve_crashkernel(void)
232 #define EBDA_ADDR_POINTER 0x40E
234 unsigned __initdata ebda_addr;
235 unsigned __initdata ebda_size;
237 static void discover_ebda(void)
240 * there is a real-mode segmented pointer pointing to the
241 * 4K EBDA area at 0x40E
243 ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER);
246 ebda_size = *(unsigned short *)__va(ebda_addr);
248 /* Round EBDA up to pages */
252 ebda_size = round_up(ebda_size + (ebda_addr & ~PAGE_MASK), PAGE_SIZE);
253 if (ebda_size > 64*1024)
257 void __init setup_arch(char **cmdline_p)
259 printk(KERN_INFO "Command line: %s\n", boot_command_line);
261 ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
262 screen_info = boot_params.screen_info;
263 edid_info = boot_params.edid_info;
264 saved_video_mode = boot_params.hdr.vid_mode;
265 bootloader_type = boot_params.hdr.type_of_loader;
267 #ifdef CONFIG_BLK_DEV_RAM
268 rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
269 rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
270 rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
272 setup_memory_region();
275 if (!boot_params.hdr.root_flags)
276 root_mountflags &= ~MS_RDONLY;
277 init_mm.start_code = (unsigned long) &_text;
278 init_mm.end_code = (unsigned long) &_etext;
279 init_mm.end_data = (unsigned long) &_edata;
280 init_mm.brk = (unsigned long) &_end;
282 code_resource.start = virt_to_phys(&_text);
283 code_resource.end = virt_to_phys(&_etext)-1;
284 data_resource.start = virt_to_phys(&_etext);
285 data_resource.end = virt_to_phys(&_edata)-1;
286 bss_resource.start = virt_to_phys(&__bss_start);
287 bss_resource.end = virt_to_phys(&__bss_stop)-1;
289 early_identify_cpu(&boot_cpu_data);
291 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
292 *cmdline_p = command_line;
296 finish_e820_parsing();
298 e820_register_active_regions(0, 0, -1UL);
300 * partially used pages are not usable - thus
301 * we are rounding upwards:
303 end_pfn = e820_end_of_ram();
304 num_physpages = end_pfn;
310 init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
317 /* setup to use the static apicid table during kernel startup */
318 x86_cpu_to_apicid_ptr = (void *)&x86_cpu_to_apicid_init;
323 * Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
324 * Call this early for SRAT node setup.
326 acpi_boot_table_init();
329 /* How many end-of-memory variables you have, grandma! */
330 max_low_pfn = end_pfn;
332 high_memory = (void *)__va(end_pfn * PAGE_SIZE - 1) + 1;
334 /* Remove active ranges so rediscovery with NUMA-awareness happens */
335 remove_all_active_ranges();
337 #ifdef CONFIG_ACPI_NUMA
339 * Parse SRAT to discover nodes.
345 numa_initmem_init(0, end_pfn);
347 contig_initmem_init(0, end_pfn);
350 /* Reserve direct mapping */
351 reserve_bootmem_generic(table_start << PAGE_SHIFT,
352 (table_end - table_start) << PAGE_SHIFT);
355 reserve_bootmem_generic(__pa_symbol(&_text),
356 __pa_symbol(&_end) - __pa_symbol(&_text));
359 * reserve physical page 0 - it's a special BIOS page on many boxes,
360 * enabling clean reboots, SMP operation, laptop functions.
362 reserve_bootmem_generic(0, PAGE_SIZE);
364 /* reserve ebda region */
366 reserve_bootmem_generic(ebda_addr, ebda_size);
368 /* reserve nodemap region */
370 reserve_bootmem_generic(nodemap_addr, nodemap_size);
374 /* Reserve SMP trampoline */
375 reserve_bootmem_generic(SMP_TRAMPOLINE_BASE, 2*PAGE_SIZE);
378 #ifdef CONFIG_ACPI_SLEEP
380 * Reserve low memory region for sleep support.
382 acpi_reserve_bootmem();
385 * Find and reserve possible boot-time SMP configuration:
388 #ifdef CONFIG_BLK_DEV_INITRD
389 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
390 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
391 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
392 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
393 unsigned long end_of_mem = end_pfn << PAGE_SHIFT;
395 if (ramdisk_end <= end_of_mem) {
396 reserve_bootmem_generic(ramdisk_image, ramdisk_size);
397 initrd_start = ramdisk_image + PAGE_OFFSET;
398 initrd_end = initrd_start+ramdisk_size;
400 printk(KERN_ERR "initrd extends beyond end of memory "
401 "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
402 ramdisk_end, end_of_mem);
407 reserve_crashkernel();
415 * set this early, so we dont allocate cpu0
416 * if MADT list doesnt list BSP first
417 * mpparse.c/MP_processor_info() allocates logical cpu numbers.
419 cpu_set(0, cpu_present_map);
422 * Read APIC and some other early information from ACPI tables.
430 * get boot-time SMP configuration:
432 if (smp_found_config)
434 init_apic_mappings();
437 * We trust e820 completely. No explicit ROM probing in memory.
439 e820_reserve_resources();
440 e820_mark_nosave_regions();
444 /* request I/O space for devices used on all i[345]86 PCs */
445 for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
446 request_resource(&ioport_resource, &standard_io_resources[i]);
452 #if defined(CONFIG_VGA_CONSOLE)
453 conswitchp = &vga_con;
454 #elif defined(CONFIG_DUMMY_CONSOLE)
455 conswitchp = &dummy_con;
460 static int __cpuinit get_model_name(struct cpuinfo_x86 *c)
464 if (c->extended_cpuid_level < 0x80000004)
467 v = (unsigned int *) c->x86_model_id;
468 cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
469 cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
470 cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
471 c->x86_model_id[48] = 0;
476 static void __cpuinit display_cacheinfo(struct cpuinfo_x86 *c)
478 unsigned int n, dummy, eax, ebx, ecx, edx;
480 n = c->extended_cpuid_level;
482 if (n >= 0x80000005) {
483 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx);
484 printk(KERN_INFO "CPU: L1 I Cache: %dK (%d bytes/line), D cache %dK (%d bytes/line)\n",
485 edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
486 c->x86_cache_size=(ecx>>24)+(edx>>24);
487 /* On K8 L1 TLB is inclusive, so don't count it */
491 if (n >= 0x80000006) {
492 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx);
493 ecx = cpuid_ecx(0x80000006);
494 c->x86_cache_size = ecx >> 16;
495 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
497 printk(KERN_INFO "CPU: L2 Cache: %dK (%d bytes/line)\n",
498 c->x86_cache_size, ecx & 0xFF);
502 cpuid(0x80000007, &dummy, &dummy, &dummy, &c->x86_power);
503 if (n >= 0x80000008) {
504 cpuid(0x80000008, &eax, &dummy, &dummy, &dummy);
505 c->x86_virt_bits = (eax >> 8) & 0xff;
506 c->x86_phys_bits = eax & 0xff;
511 static int nearby_node(int apicid)
514 for (i = apicid - 1; i >= 0; i--) {
515 int node = apicid_to_node[i];
516 if (node != NUMA_NO_NODE && node_online(node))
519 for (i = apicid + 1; i < MAX_LOCAL_APIC; i++) {
520 int node = apicid_to_node[i];
521 if (node != NUMA_NO_NODE && node_online(node))
524 return first_node(node_online_map); /* Shouldn't happen */
529 * On a AMD dual core setup the lower bits of the APIC id distingush the cores.
530 * Assumes number of cores is a power of two.
532 static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
537 int cpu = smp_processor_id();
539 unsigned apicid = hard_smp_processor_id();
541 unsigned ecx = cpuid_ecx(0x80000008);
543 c->x86_max_cores = (ecx & 0xff) + 1;
545 /* CPU telling us the core id bits shift? */
546 bits = (ecx >> 12) & 0xF;
548 /* Otherwise recompute */
550 while ((1 << bits) < c->x86_max_cores)
554 /* Low order bits define the core id (index of core in socket) */
555 c->cpu_core_id = c->phys_proc_id & ((1 << bits)-1);
556 /* Convert the APIC ID into the socket ID */
557 c->phys_proc_id = phys_pkg_id(bits);
560 node = c->phys_proc_id;
561 if (apicid_to_node[apicid] != NUMA_NO_NODE)
562 node = apicid_to_node[apicid];
563 if (!node_online(node)) {
564 /* Two possibilities here:
565 - The CPU is missing memory and no node was created.
566 In that case try picking one from a nearby CPU
567 - The APIC IDs differ from the HyperTransport node IDs
568 which the K8 northbridge parsing fills in.
569 Assume they are all increased by a constant offset,
570 but in the same order as the HT nodeids.
571 If that doesn't result in a usable node fall back to the
572 path for the previous case. */
573 int ht_nodeid = apicid - (cpu_data(0).phys_proc_id << bits);
574 if (ht_nodeid >= 0 &&
575 apicid_to_node[ht_nodeid] != NUMA_NO_NODE)
576 node = apicid_to_node[ht_nodeid];
577 /* Pick a nearby node */
578 if (!node_online(node))
579 node = nearby_node(apicid);
581 numa_set_node(cpu, node);
583 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
588 #define ENABLE_C1E_MASK 0x18000000
589 #define CPUID_PROCESSOR_SIGNATURE 1
590 #define CPUID_XFAM 0x0ff00000
591 #define CPUID_XFAM_K8 0x00000000
592 #define CPUID_XFAM_10H 0x00100000
593 #define CPUID_XFAM_11H 0x00200000
594 #define CPUID_XMOD 0x000f0000
595 #define CPUID_XMOD_REV_F 0x00040000
597 /* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
598 static __cpuinit int amd_apic_timer_broken(void)
601 u32 eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
602 switch (eax & CPUID_XFAM) {
604 if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
608 rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
609 if (lo & ENABLE_C1E_MASK)
613 /* err on the side of caution */
619 static void __cpuinit init_amd(struct cpuinfo_x86 *c)
627 * Disable TLB flush filter by setting HWCR.FFDIS on K8
628 * bit 6 of msr C001_0015
630 * Errata 63 for SH-B3 steppings
631 * Errata 122 for all steppings (F+ have it disabled by default)
634 rdmsrl(MSR_K8_HWCR, value);
636 wrmsrl(MSR_K8_HWCR, value);
640 /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
641 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
642 clear_bit(0*32+31, &c->x86_capability);
644 /* On C+ stepping K8 rep microcode works well for copy/memset */
645 level = cpuid_eax(1);
646 if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58))
647 set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
648 if (c->x86 == 0x10 || c->x86 == 0x11)
649 set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
651 /* Enable workaround for FXSAVE leak */
653 set_bit(X86_FEATURE_FXSAVE_LEAK, &c->x86_capability);
655 level = get_model_name(c);
659 /* Should distinguish Models here, but this is only
660 a fallback anyways. */
661 strcpy(c->x86_model_id, "Hammer");
665 display_cacheinfo(c);
667 /* c->x86_power is 8000_0007 edx. Bit 8 is constant TSC */
668 if (c->x86_power & (1<<8))
669 set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
671 /* Multi core CPU? */
672 if (c->extended_cpuid_level >= 0x80000008)
675 if (c->extended_cpuid_level >= 0x80000006 &&
676 (cpuid_edx(0x80000006) & 0xf000))
677 num_cache_leaves = 4;
679 num_cache_leaves = 3;
681 if (c->x86 == 0xf || c->x86 == 0x10 || c->x86 == 0x11)
682 set_bit(X86_FEATURE_K8, &c->x86_capability);
684 /* RDTSC can be speculated around */
685 clear_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
687 /* Family 10 doesn't support C states in MWAIT so don't use it */
688 if (c->x86 == 0x10 && !force_mwait)
689 clear_bit(X86_FEATURE_MWAIT, &c->x86_capability);
691 if (amd_apic_timer_broken())
692 disable_apic_timer = 1;
695 static void __cpuinit detect_ht(struct cpuinfo_x86 *c)
698 u32 eax, ebx, ecx, edx;
699 int index_msb, core_bits;
701 cpuid(1, &eax, &ebx, &ecx, &edx);
704 if (!cpu_has(c, X86_FEATURE_HT))
706 if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
709 smp_num_siblings = (ebx & 0xff0000) >> 16;
711 if (smp_num_siblings == 1) {
712 printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
713 } else if (smp_num_siblings > 1 ) {
715 if (smp_num_siblings > NR_CPUS) {
716 printk(KERN_WARNING "CPU: Unsupported number of the siblings %d", smp_num_siblings);
717 smp_num_siblings = 1;
721 index_msb = get_count_order(smp_num_siblings);
722 c->phys_proc_id = phys_pkg_id(index_msb);
724 smp_num_siblings = smp_num_siblings / c->x86_max_cores;
726 index_msb = get_count_order(smp_num_siblings) ;
728 core_bits = get_count_order(c->x86_max_cores);
730 c->cpu_core_id = phys_pkg_id(index_msb) &
731 ((1 << core_bits) - 1);
734 if ((c->x86_max_cores * smp_num_siblings) > 1) {
735 printk(KERN_INFO "CPU: Physical Processor ID: %d\n", c->phys_proc_id);
736 printk(KERN_INFO "CPU: Processor Core ID: %d\n", c->cpu_core_id);
743 * find out the number of processor cores on the die
745 static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
749 if (c->cpuid_level < 4)
752 cpuid_count(4, 0, &eax, &t, &t, &t);
755 return ((eax >> 26) + 1);
760 static void srat_detect_node(void)
764 int cpu = smp_processor_id();
765 int apicid = hard_smp_processor_id();
767 /* Don't do the funky fallback heuristics the AMD version employs
769 node = apicid_to_node[apicid];
770 if (node == NUMA_NO_NODE)
771 node = first_node(node_online_map);
772 numa_set_node(cpu, node);
774 printk(KERN_INFO "CPU %d/%x -> Node %d\n", cpu, apicid, node);
778 static void __cpuinit init_intel(struct cpuinfo_x86 *c)
783 init_intel_cacheinfo(c);
784 if (c->cpuid_level > 9 ) {
785 unsigned eax = cpuid_eax(10);
786 /* Check for version and the number of counters */
787 if ((eax & 0xff) && (((eax>>8) & 0xff) > 1))
788 set_bit(X86_FEATURE_ARCH_PERFMON, &c->x86_capability);
793 rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
795 set_bit(X86_FEATURE_BTS, c->x86_capability);
797 set_bit(X86_FEATURE_PEBS, c->x86_capability);
800 n = c->extended_cpuid_level;
801 if (n >= 0x80000008) {
802 unsigned eax = cpuid_eax(0x80000008);
803 c->x86_virt_bits = (eax >> 8) & 0xff;
804 c->x86_phys_bits = eax & 0xff;
805 /* CPUID workaround for Intel 0F34 CPU */
806 if (c->x86_vendor == X86_VENDOR_INTEL &&
807 c->x86 == 0xF && c->x86_model == 0x3 &&
809 c->x86_phys_bits = 36;
813 c->x86_cache_alignment = c->x86_clflush_size * 2;
814 if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
815 (c->x86 == 0x6 && c->x86_model >= 0x0e))
816 set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
818 set_bit(X86_FEATURE_REP_GOOD, &c->x86_capability);
820 set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
822 clear_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability);
823 c->x86_max_cores = intel_num_cpu_cores(c);
828 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
830 char *v = c->x86_vendor_id;
832 if (!strcmp(v, "AuthenticAMD"))
833 c->x86_vendor = X86_VENDOR_AMD;
834 else if (!strcmp(v, "GenuineIntel"))
835 c->x86_vendor = X86_VENDOR_INTEL;
837 c->x86_vendor = X86_VENDOR_UNKNOWN;
840 struct cpu_model_info {
843 char *model_names[16];
846 /* Do some early cpuid on the boot CPU to get some parameter that are
847 needed before check_bugs. Everything advanced is in identify_cpu
849 void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
853 c->loops_per_jiffy = loops_per_jiffy;
854 c->x86_cache_size = -1;
855 c->x86_vendor = X86_VENDOR_UNKNOWN;
856 c->x86_model = c->x86_mask = 0; /* So far unknown... */
857 c->x86_vendor_id[0] = '\0'; /* Unset */
858 c->x86_model_id[0] = '\0'; /* Unset */
859 c->x86_clflush_size = 64;
860 c->x86_cache_alignment = c->x86_clflush_size;
861 c->x86_max_cores = 1;
862 c->extended_cpuid_level = 0;
863 memset(&c->x86_capability, 0, sizeof c->x86_capability);
865 /* Get vendor name */
866 cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
867 (unsigned int *)&c->x86_vendor_id[0],
868 (unsigned int *)&c->x86_vendor_id[8],
869 (unsigned int *)&c->x86_vendor_id[4]);
873 /* Initialize the standard set of capabilities */
874 /* Note that the vendor-specific code below might override */
876 /* Intel-defined flags: level 0x00000001 */
877 if (c->cpuid_level >= 0x00000001) {
879 cpuid(0x00000001, &tfms, &misc, &c->x86_capability[4],
880 &c->x86_capability[0]);
881 c->x86 = (tfms >> 8) & 0xf;
882 c->x86_model = (tfms >> 4) & 0xf;
883 c->x86_mask = tfms & 0xf;
885 c->x86 += (tfms >> 20) & 0xff;
887 c->x86_model += ((tfms >> 16) & 0xF) << 4;
888 if (c->x86_capability[0] & (1<<19))
889 c->x86_clflush_size = ((misc >> 8) & 0xff) * 8;
891 /* Have CPUID level 0 only - unheard of */
896 c->phys_proc_id = (cpuid_ebx(1) >> 24) & 0xff;
901 * This does the hard work of actually picking apart the CPU stuff...
903 void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
908 early_identify_cpu(c);
910 /* AMD-defined flags: level 0x80000001 */
911 xlvl = cpuid_eax(0x80000000);
912 c->extended_cpuid_level = xlvl;
913 if ((xlvl & 0xffff0000) == 0x80000000) {
914 if (xlvl >= 0x80000001) {
915 c->x86_capability[1] = cpuid_edx(0x80000001);
916 c->x86_capability[6] = cpuid_ecx(0x80000001);
918 if (xlvl >= 0x80000004)
919 get_model_name(c); /* Default name */
922 /* Transmeta-defined flags: level 0x80860001 */
923 xlvl = cpuid_eax(0x80860000);
924 if ((xlvl & 0xffff0000) == 0x80860000) {
925 /* Don't set x86_cpuid_level here for now to not confuse. */
926 if (xlvl >= 0x80860001)
927 c->x86_capability[2] = cpuid_edx(0x80860001);
930 init_scattered_cpuid_features(c);
932 c->apicid = phys_pkg_id(0);
935 * Vendor-specific initialization. In this section we
936 * canonicalize the feature flags, meaning if there are
937 * features a certain CPU supports which CPUID doesn't
938 * tell us, CPUID claiming incorrect flags, or other bugs,
939 * we handle them here.
941 * At the end of this section, c->x86_capability better
942 * indicate the features this CPU genuinely supports!
944 switch (c->x86_vendor) {
949 case X86_VENDOR_INTEL:
953 case X86_VENDOR_UNKNOWN:
955 display_cacheinfo(c);
959 select_idle_routine(c);
963 * On SMP, boot_cpu_data holds the common feature set between
964 * all CPUs; so make sure that we indicate which features are
965 * common between the CPUs. The first time this routine gets
966 * executed, c == &boot_cpu_data.
968 if (c != &boot_cpu_data) {
969 /* AND the already accumulated flags with these */
970 for (i = 0 ; i < NCAPINTS ; i++)
971 boot_cpu_data.x86_capability[i] &= c->x86_capability[i];
974 #ifdef CONFIG_X86_MCE
977 if (c != &boot_cpu_data)
980 numa_add_cpu(smp_processor_id());
985 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
987 if (c->x86_model_id[0])
988 printk("%s", c->x86_model_id);
990 if (c->x86_mask || c->cpuid_level >= 0)
991 printk(" stepping %02x\n", c->x86_mask);
997 * Get CPU information for use by the procfs.
1000 static int show_cpuinfo(struct seq_file *m, void *v)
1002 struct cpuinfo_x86 *c = v;
1006 * These flag bits must match the definitions in <asm/cpufeature.h>.
1007 * NULL means this bit is undefined or reserved; either way it doesn't
1008 * have meaning as far as Linux is concerned. Note that it's important
1009 * to realize there is a difference between this table and CPUID -- if
1010 * applications want to get the raw CPUID data, they should access
1011 * /dev/cpu/<cpu_nr>/cpuid instead.
1013 static const char *const x86_cap_flags[] = {
1015 "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
1016 "cx8", "apic", NULL, "sep", "mtrr", "pge", "mca", "cmov",
1017 "pat", "pse36", "pn", "clflush", NULL, "dts", "acpi", "mmx",
1018 "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", "pbe",
1021 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1022 NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL,
1023 NULL, NULL, NULL, NULL, "nx", NULL, "mmxext", NULL,
1024 NULL, "fxsr_opt", "pdpe1gb", "rdtscp", NULL, "lm",
1025 "3dnowext", "3dnow",
1027 /* Transmeta-defined */
1028 "recovery", "longrun", NULL, "lrti", NULL, NULL, NULL, NULL,
1029 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1030 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1031 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1033 /* Other (Linux-defined) */
1034 "cxmmx", "k6_mtrr", "cyrix_arr", "centaur_mcr",
1035 NULL, NULL, NULL, NULL,
1036 "constant_tsc", "up", NULL, "arch_perfmon",
1037 "pebs", "bts", NULL, "sync_rdtsc",
1038 "rep_good", NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1039 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1041 /* Intel-defined (#2) */
1042 "pni", NULL, NULL, "monitor", "ds_cpl", "vmx", "smx", "est",
1043 "tm2", "ssse3", "cid", NULL, NULL, "cx16", "xtpr", NULL,
1044 NULL, NULL, "dca", "sse4_1", "sse4_2", NULL, NULL, "popcnt",
1045 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1047 /* VIA/Cyrix/Centaur-defined */
1048 NULL, NULL, "rng", "rng_en", NULL, NULL, "ace", "ace_en",
1049 "ace2", "ace2_en", "phe", "phe_en", "pmm", "pmm_en", NULL, NULL,
1050 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1051 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1053 /* AMD-defined (#2) */
1054 "lahf_lm", "cmp_legacy", "svm", "extapic",
1055 "cr8_legacy", "abm", "sse4a", "misalignsse",
1056 "3dnowprefetch", "osvw", "ibs", "sse5",
1057 "skinit", "wdt", NULL, NULL,
1058 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1059 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1061 /* Auxiliary (Linux-defined) */
1062 "ida", NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1063 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1064 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1065 NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
1067 static const char *const x86_power_flags[] = {
1068 "ts", /* temperature sensor */
1069 "fid", /* frequency id control */
1070 "vid", /* voltage id control */
1071 "ttp", /* thermal trip */
1076 "", /* tsc invariant mapped to constant_tsc */
1085 seq_printf(m,"processor\t: %u\n"
1087 "cpu family\t: %d\n"
1089 "model name\t: %s\n",
1091 c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
1094 c->x86_model_id[0] ? c->x86_model_id : "unknown");
1096 if (c->x86_mask || c->cpuid_level >= 0)
1097 seq_printf(m, "stepping\t: %d\n", c->x86_mask);
1099 seq_printf(m, "stepping\t: unknown\n");
1101 if (cpu_has(c,X86_FEATURE_TSC)) {
1102 unsigned int freq = cpufreq_quick_get((unsigned)cpu);
1105 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
1106 freq / 1000, (freq % 1000));
1110 if (c->x86_cache_size >= 0)
1111 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
1114 if (smp_num_siblings * c->x86_max_cores > 1) {
1115 seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
1116 seq_printf(m, "siblings\t: %d\n",
1117 cpus_weight(per_cpu(cpu_core_map, cpu)));
1118 seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
1119 seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
1125 "fpu_exception\t: yes\n"
1126 "cpuid level\t: %d\n"
1133 for ( i = 0 ; i < 32*NCAPINTS ; i++ )
1134 if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
1135 seq_printf(m, " %s", x86_cap_flags[i]);
1138 seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
1139 c->loops_per_jiffy/(500000/HZ),
1140 (c->loops_per_jiffy/(5000/HZ)) % 100);
1142 if (c->x86_tlbsize > 0)
1143 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
1144 seq_printf(m, "clflush size\t: %d\n", c->x86_clflush_size);
1145 seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
1147 seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
1148 c->x86_phys_bits, c->x86_virt_bits);
1150 seq_printf(m, "power management:");
1153 for (i = 0; i < 32; i++)
1154 if (c->x86_power & (1 << i)) {
1155 if (i < ARRAY_SIZE(x86_power_flags) &&
1157 seq_printf(m, "%s%s",
1158 x86_power_flags[i][0]?" ":"",
1159 x86_power_flags[i]);
1161 seq_printf(m, " [%d]", i);
1165 seq_printf(m, "\n\n");
1170 static void *c_start(struct seq_file *m, loff_t *pos)
1172 if (*pos == 0) /* just in case, cpu 0 is not the first */
1173 *pos = first_cpu(cpu_online_map);
1174 if ((*pos) < NR_CPUS && cpu_online(*pos))
1175 return &cpu_data(*pos);
1179 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1181 *pos = next_cpu(*pos, cpu_online_map);
1182 return c_start(m, pos);
1185 static void c_stop(struct seq_file *m, void *v)
1189 struct seq_operations cpuinfo_op = {
1193 .show = show_cpuinfo,